Micra K11 low on power

Hi All,

Have a quick query, my Micra seems to be low on power in 5th gear and running lumpy (seems a small misfire). It's only doing around 80mph with nothing left. Acceleration is slow aswell.

I recently put in a cg13 1.3 inlet camshaft. Just wondering do I need to change the timing slightly (advance distributer)?

spec of engine
1.0L cg10
1.3 cg13 inlet camshaft
Almera n15 airbox with pipe to front of radiator

Spec of the car 1997 pre facelift 3 door

Thanks in advance!